Heat transfer roll

ABSTRACT

An inner cylindrical shell; an outer cylindrical shell enclosing, and spaced from, the inner shell to provide a jacket adapted to hold a high boiling point liquid; a source of heat in said inner shell for heating the liquid, and agitating means operable when the roll is rotated to bring said liquid into uniform contact with the inner surface of said outer shell.

United States Patent Parkes [54] HEAT TRANSFER ROLL [72] Inventor: Ralph C. Parkes, Hancock Street and Lehigh Avenue, Philadelphia, Pa. 19133 22 Filed: Jan. 5, 1971 21 Appl.No.: 104,005

'[52] US. Cl .....l65/89, 26/1, 126/410,

51 Int. Cl. ..F28t 5/02 581 Field ofSearchm, ..l65/89, 90, 104, 107; 26/1; 126/410; 263/6 c; 219/469, 470, 471

[56] References Cited UNITED STATES PATENTS 2,488,937 11/1949 Roberts ..26/1

[ 1 June 6, 1972 3,331,434 7/1967 Lockhart ..l65/89 3,452,967 7/1969 Durand ..263/6C 7 Primary Examiner--Albert W. Davis, Jr.

Attorney-Louis Necho 57 ABSTRACT An inner cylindrical shell; an outer cylindrical shell enclosing,

and spaced from, the inner shell to provide a jacket adapted to hold a high boiling point liquid; at source of heat in said inner shell for heating the liquid, and agitating means operable when the roll'is rotated to bring said liquid into uniform'contact with the inner surface of said outer shell.

3 Clains, 5 Drawing Figures INVENTOR. RALPH C. PARKES ATTORNEY.

PATENTEDJUH 6 I972 PATENTEDJUH 6 I972 SHEET 2 BF 2 INVENTOR. RALPH C. PARKES BY M ATTORNEY.

HEAT TRANSFER ROLL THE BACKGROUND In the manufacture of fabrics, especially those made of synthetic materials, it is the practice to bring the fabric into running contact with the heated surface of one or more rolls. In order to obtain uniform heating ofv the surface of the roll, each roll is provided with a jacket which contains a high-boiling-point liquid and a source of heat for heating said liquid. Each jacket is also provided with a vane which, when the roll is rotated, propels the liquid in the jacket axially of the roll so as to obtain a uniform temperature over the entire surface of the roll. For more information, reference may be had to Roberts U.S. Pat. No. 2,488,937. It only remains to add that, the rotation of the roll generates a commensurate centrifugal force which impels the liquid radially, or, at a right angle to the mechanically induced movement of the liquid, axially of the roll. It therefore follows that for optimum results, the rate of rotation of the roll must be limited so that the centrifugal force generated by therotation of the roll will not be strong enoughto prevent, or to materially retard, movement of the liquid axially of the roll. Other things being equal, decrease in the rate of rotation of the roll decreases the efficiency of the operation. In actual use, the centrifugal force generated by the Roberts machine was small enough to permit the liquid to be moved in one direction by the mechanical force of the vane, and to be moved in theopposite direction by gravity. Even with these limitations, the Roberts apparatus was extremely successful and received wide acceptance.

THE INVENTION The invention resides in an apparatus wherein the liquid in the jacket is forcefully moved in one direction axially of the roll by one vane, and wherein the liquid is forcefullymoved in the opposite'direction by another suitably oriented vaheQFor optimum results, the rate of rotation of the roll must be such that the centrifugal force generated will always be less than that needed to immobilize the liquid.

In the drawings:

FIG. 1 is a plan view of one roll embodying the invention.

FIG. 2 is a developed view, on a reduced scale, and showing the structure and disposition of the vanes.

FIG. 3 is a sectional view looking in the direction of line 3 3onFIG.l.

FIG. 4 is a similar to FIG. 1 but shows the application of a plurality of longitudinally spaced pairs of vanes to a roll larger than that shown in FIG. 1.

FIG. 5 is similar to FIG. 2 but relates FIG. 4.

In FIGS. 1 to 3, there is shown a roll l0 which is formed of an inner shell 12 and an outer shell 14 which co-act with adjacent end walls 13 and 15 to produce a jacket 16 for containing a high-boiling-point liquid such as Dow Therm and other similar liquids which are available on the market. I

Each roll is provided with a burner 18 which may be like those shown in the Roberts Patent.

According to this invention, each jacket 16 is provided with, at least, two opposed vanes 20 and 22 which are disposed longitudinally of the axes of the rolls and staggered axially with respect to each other. The height of the vanes, measured head-on, as in FIG. 3, is less than the depth of the jacket so as to provide a passage 23 through which liquid on one side of the vane can flow, through passage 23, to the other side thereof.

to the roll shown in THE OPERATION flow from the vicinity of end 24 toward end 28, and vane 22 will cause liquid to flow from the vicinity of end 32 toward end one direction, by one vane, is forcibly returned by the other vane, as distinguished from apparatus wherein one vane propels the liquid in one direction and in which the liquid displaced by said vane is returned by gravity, as in the Roberts Patent, for example.

FIG. 4 shows the application of the invention to a roll II which is longer and has a larger diameter than, roll 10. In this embodiment, the jacket is provided with a plurality of axially and radially disposed pairs of vanes which structurally and functionally, are the same as vanes 20 and 22 of FIG. I. Since the structure has been described, it only remains to exemplify the operation which is best shown in FIG. 4. For example; liquid moving in the direction of arrow will be guided by vanes 40a and 40b through gate" 51, per arrow 71. Some of the liquid will be guided by vanes40a and 40d to gate 52,as per arrow 72. Some of the liquid passing through gate 51 will flow through gate 55 to which it is guided by vanes 40c and 40d as per arrow 73. Some of the liquid which flows through gate 54 is guided by vanes 40b and 400 as per arrow 74. The liquid then flows as per arrow 75, and so on.

From the foregoing, it will be seen that liquid is propelled from lefi to right as shown by arrows 71, 74, 76, and 78, and that liquid is moved from right to left as shown by arrows 70, 73, 75, and 79. v

The operation of this embodiment is as follows. The desired number of vanes is mounted within the jacket and the roll is rotated at a speed which will not generate enough centrifugal force to retard, or to prevent free movement of the liquid by one vane or another. In response to the rotation of the roll in clockwise direction, as viewed from position A in FIG. I, will cause all vanes which correspond to vane 20 to function like this vane, and will cause the vanes which correspond to vane 22 to function like vane 22. As in the first embodiment, rotating the roll in counter-clockwise direction reverses the operation of the vanesof FIG. 4, as it does the operation of the vanes in FIG. 1. By this arrangement, each pair of vanes will reciprocate the liquid around it after the manner of vanes 20 and 22. It will be noted that liquid propelled in one direction by one vane will move, by momentum, beyond the end of the vane propelling it. This causes the liquid moved in one direction by one vane to clash with the body of liquid propelled in another direction by an adjacent vane. This movement of the liquid is visible to the naked eye in a prototype formed of transparent material, and produces a mixing effect which makes for more uniform heat distribution.

In the drawings, end 32 of vane 22, and end 24 of vane 20 are shown, as touching the respective end walls 15 and 13. This arrangement is satisfactory but, in practice, the ends mentioned stop short of the end walls of the jacket so as to provide a passage for the liquid which-washes the extreme ends of the jacket.

What I claim is:

l. A heat transfer roll, including an inner shell,

means for heating said inner shell,

an outer shell enclosing said inner shell to form a jacket for containing a liquid for transmitting heat from the inner to the outer shell,

at least one first curved vane within, and extending longitudinally of said jacket,

at least one second oppositely curved vane within, and extending longitudinally of, said jacket, said first and said second vane being co-extensive and each of them being shorter than said jacket,

said vanes being axially staggered so that the ends of said first vane well be out of alignment with the corresponding end of said second vane,

whereby the juxtaposed end portions of said va es form 3. The roll defined in claim 1 wherein the height of each gates Passage f liquid P p y Said end P vane is less than the height of the jacket to proyide a passage tion of said vanes. 2. The roll defined in claim 1 wherein said vanes are angu- 12232; zfi zfgfi gig ggg fimfir gs edge of the larly displaced and are oppositely curved about their respective axes. 

1. A heat transfer roll, including an inner shell, means for heating said inner shell, an outer shell enclosing said inner shell to form a jacket for containing a liquid for transmitting heat from the inner to the outer shell, at least one first curved vane within, and extending longitudinally of said jacket, at least one second oppositely curved vane within, and extending longitudinally of, said jacket, said first and said second vane being co-extensive and each of them being shorter than said jacket, said vanes being axially staggered so that the ends of said first vane well be out of alignment with the corresponding end of said second vane, whereby the juxtaposed end portions of said vanes form gates for the passage of liquid propelled by said end portion of said vanes.
 2. The roll defined in claim 1 wherein said vanes are angularly displaced and are oppositely curved about their respective axes.
 3. The roll defined in claim 1 wherein the height of each vane is less than the height of the jacket to provide a passage for radial movement of liquid between the outer edge of the vane and the inner surface of said outer shell. 